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�00 <br /> "TWINING <br /> CONCRETE INSIGHT <br /> Morrison Quarry Rock Petrography Page 48 <br /> 4.7 Rock Sample HDR-004 (383.0-383.9): Talc-Biotite-Hornblende Schist <br /> Received Condition <br /> The sample is a cored rock fragment that measures —60 mm (2 % in.) in diameter and <br /> —270-300 mm (10 % - 11 7/8 in.) in length (Figure 4.7a). Both ends of the core are fractured <br /> surfaces and the side surfaces are rough cored surfaces. The core was received intact in one <br /> piece. No weathered surfaces are present. <br /> Polished Slab <br /> The rock on the polished surface is reddish-brown and bluish-gray to bluish-black (Munsell <br /> Soil Color 2.5YR 4-5/3 and GLEY 2 2.5-4/5PB) and predominantly consists of foliated <br /> hornblende and biotite, with minor amounts of quartz, orthoclase feldspar, and talc <br /> (Figure 4.7b, Figure 4.7c). The rock predominantly exhibits a schistosity texture as <br /> indicated by a preferred orientation of inequaint mineral grains (hornblende, biotite). The <br /> rock sample also exhibits areas that show a poorly developed gneissose structure indicated by <br /> segregation (e.g. banding) of orthoclase feldspar and quartz. Quartz and feldspar grains <br /> measured up to —1 (40 mil) in diameter. Minor amounts of talc is observed within interstitial <br /> spaces. The rock sample is hard and competent, and exhibits a Mohs hardness of 3-4+. <br /> Thin Section <br /> The rock is a medium-grade metamorphic rock classified as a talc-biotite-hornblende schist <br /> (Figure 4.7d, Figure 4.7e). The sample consists of major amounts (>10%) of fine grained <br /> hornblende and biotite measuring up to —1 mm (40 mil) in diameter, and minor amounts <br /> (1-10%) of quartz, orthoclase feldspar, and talc. Trace amounts (<1%) of opaque minerals is <br /> also observed. Hornblende and biotite grains are elongated in shape and exhibit a preferred <br /> orientation. Quartz and felspar grains are subhedral to anhedral in shape and occasionally <br /> occur as segregated layers. Talc occasionally fills interstitial spaces. <br /> Major minerals Hornblende(-50-601/o),biotite(-20-301/o) <br /> (10-100%by volume of rock) <br /> Minor minerals Q ( �/o) par Quartz —5-10 ,feldspar 5 <br /> (1-10%by volume of rock) -10/o <br /> ° )�talc(�l-5%) <br /> Trace minerals Opaque minerals <br /> (<1/o by volume of rock) <br /> Report No. 227893.d 22 November 2022 <br />